Test: Operations on large Numbers - CTET & State TET MCQ

Commutative property: r + s = s + r
We can add numbers in any order and get the same sum.
Here 8 + 4 = 4 + 8 shows the commutative property.

20 x 2.5 = 50


         

Identity property: t = 0 + t, Adding zero does not change a number. Here 0 + 3 = 3 shows the identity property where adding zero does not change the sum.

Look for numbers in the box that are greater than 0.3.

• Try 0.7. What number can you subtract from 0.7 to get 0.3? 0.7 - 0.4 = 0.3
  0.4 is not in the box.
• Try 0.5. What number can you subtract from 0.5 to get 0.3? 0.5 - 0.2 = 0.3, 0.2 is not in the box.
• Try 0.8. What number can you subtract from 0.8 to get 0.3? 0.8 - 0.5 = 0.3
  0.5 is in the box. The numbers 0.8 and 0.5 have a difference of 0.3.

Commutative property: We can multiply in any order and get the same product.

According to BODMAS, the correct order of operations is Division - Multiplication - Addition - Subtraction.

Let 'a' be subtracted from 14 y to get 8. Then, 14y - a = 8 ⇒ a = 14y - 8.

86 - 23 = 63, Now evaluating the options, we get 7 x 9 = 63, 3 x 21 = 63, 45 + 18 = 63 and 187 ÷ 2 = 93.5. Thus the solution other than 63 is the odd one out. Therefore is the odd one out.

96 ÷ 2 = 48, Now evaluating the options, we get, 2 x 24 = 48, 4 x 12 = 48, 8 x 6 = 48 and 7 x 8 = 56. 
Thus the solution other than 48 is the odd one out. Therefore is the odd one out.

4a + 3 = 15 
⇒ 4a = 15 - 3 = 12 
⇒ a = 12 ÷ 4 = 3
∴ 2a = 2 x 3 = 6

Mangoes in 100 boxes =
Mangoes in 1 box 
Mangoes in 75 boxes

Let the number of notes of each kind be x. Then 10x + 5x + 2x = 510 ⇒ x = 510 / 17 = 30.

Look for numbers in the box that are less than 2.7.

• Try 0.2. Now we have to find the number which when added to 0.2 gives 2.7.
• That number is 2.5. thus 2.5 + 0.2 = 2.7.

3 x 15 = 45 and also 15 x 3 = 45. Thus A is true. 3 ÷ 2 = 1.5 and 2 ÷ 3 = 0.66 which are not equal. Therefore only statement A is true.

24 x 65 = 1560

2547 + 9998 = 12545

No. of spoiled roses = 182039 ÷ 13 = 14,003

881 + 88 = 969

428.65 + 500.5 = 929.15 [Since 500.5 = 500.50]

​1042 x 5 = 5210